refactor: make shared_qobject_ptr ctor explicit

This turns issues like creating two shared ptrs from a single raw ptr
from popping up at runtime, instead making them a compile error.

Signed-off-by: flow <flowlnlnln@gmail.com>

launcher/ui/pages/instance/VersionPage.cpp

@@ -660,7 +660,7 @@ void VersionPage::onGameUpdateError(QString error)
     CustomMessageBox::selectable(this, tr("Error updating instance"), error, QMessageBox::Warning)->show();
 }
 
-Component * VersionPage::current()
+ComponentPtr VersionPage::current()
 {
     auto row = currentRow();
     if(row < 0)

launcher/ui/pages/instance/VersionPage.h

@@ -99,7 +99,7 @@ private slots:
     void updateVersionControls();
 
 private:
-    Component * current();
+    ComponentPtr current();
     int currentRow();
     void updateButtons(int row = -1);
     void preselect(int row = 0);